Supplemental Oil and Gas Disclosures (Unaudited) (Standardized Measure of Discounted Future Cash Flows Relating to Proved Reserves Disclosure) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Oil and Gas Exploration and Production Industries Disclosures [Abstract]
Future cash inflows	$ 50,499	$ 132,037	$ 75,314
Future production costs	(26,147)	(29,632)	(23,235)
Future development costs (1)	(6,558)	(7,458)	(6,032)
Future income tax expense	(1,581)	(19,323)	(8,135)
Future net cash flows	16,213	75,624	37,912
10% annual discount for estimated timing of cash flows	(8,900)	(38,036)	(19,181)
Standardized measure of discounted future net cash flows	$ 7,313	$ 37,588	$ 18,731	$ 1,847